13.17.4 Defining setf expanders in protected packages

The
defsetf
or
define-setf-expander
forms now check the
access-fn
using the values of
hcl:*packages-for-warn-on-redefinition*
and
lw:*handle-warn-on-redefinition*
, to guard against setf expanders being defined (or redefined) in protected packages.